New user transfer date

My phone should be transferred from BT to Plusnet on 8th December 2017. Is that when my new PN Fibre broadband will start as well?

My reason for asking is that there may be nobody here for about 24 hours to set the router up, so will leaving it for a few hours before setting up the router cause any problems with getting getting online? ( I intend to use my BT Smart Hub),